Lathe.



No. 894,635. PATENTED JULY 28, 1908. I'. HADINGE.

LATHE.

APPLICATION FILED DEO. 21| 1904.

I Vlim mmm mm i m Hlillllllllllllmly i Q Winassas: Inval-:Tr z Y MwWww/wlw- Frimmm Hardinga Specification of Letters Patent.

Patented July 28, 1908.

p'plication'led December 21, 1904. Serial No. 237,767.

To all whom it mayconcern.:V

Be it known that I', FRANKLIN HARDINGE, a citizen of the United States,.residing at Chicago, in the county of Cookand State of l Illinois, haveinvented a certain-'new and useful Improvement in Lathes, (Case 3 ofwhich the fol owing is afull,'clea`r, concise, and exact description,reference being hadl to the accompanying drawings, specification.

Mly invention relates to lathes particular y to the manner of attachingwork holdor vdrivin parts to the lathe spindle.

In lathes o t e prior art, attachments such as face plates chucks or thelike have been,

screw threaded to the noseof the lathe head spindle but this manner ofattachment isobjectionable in'many ways. r It is a very lathe `threadedborious operation to appl ace plate to the t ea'ded spindle,`

chuck or it being particularly laborious to catch the threads properly.The threads alsol are apt to introduce error. Again the cost ofconl.struction of the lathe is greatly increased on account of the threadswhich must be very accurately cut.

In my invention, I obviate all these diiiiculties and I provide a verymuch simplified' -means of attaching the work driver to the spindlewithout the use of threads. I taper t e nose of the lathe spindle andprovide thereon a slot which 'extends from the front end of the noserally a short distance in either the driving plate,

longitudinally and then spidirection, and chuck or other Work driver istapered correspondingly and provided with a pin which engages the slot.As thework driver is applied to the nose of the spindle the pin iscaused to en age lin the horizontal -slot and to pass along t eslot intoone of--the spiral extensions according-to ythe direction o subsequentrotation thereof. As'the lathe is now driven and resistance offered thework driver the spiral slot acting on thepin will cause the work driverto be iirmly wedged to the tapered nose and the greater the resistanceto the work driver the greater `willbe this wedgin action and securelywill the wor driver be secured to the spindle. To remove the workdriven-a slight ta will loosen it and it canbe readilyremove y. It caneasily be seen that this manner of attachment of the work driver to thelathe is very much more simple than securing it thereto by means ofthreads. Many modifications may also be made in this manner of forming apart ,ofy this by, part of the driving part being attachment, forinstance, the sv indle nose may be provided with a pin and t e slotsdisposed in thework driver, the same result, owever, being accomplished.Several slots `and severalipins also may be employed.

l-My invention will be better understoodwith reference to theaccompanying drawing, n

in which -v Figure 1 is an elevation viewl of the lathe head andmaterial to be'worked driven there- 'cut away to reveal the slot on thespindle, Fig. 2

" shows a cross sectional view\of thev spindle nose and driving plateattached thereto, both shown in diametrical section a center in beingshown inserted in the spindle, ig. 3 shows a view like Fig. 2, the slot,however,

i being shown in thel driving late there being no center in shown,l Fig.4 s ows-the-fspindle nose and t e driving plate in diametrical'sectiondisconnectedtherefrom, Fig. 5 is a front view of the nose shown in Fig.4. Fig. 6

shows a modified arrangement of the slot.

Like reference characters refer to like parts throughout the variousiigures.

The lathe head consists ofthe base 2 supporting the bearings 3 and 4,through which passes the lathe spindle 5.l Upon the spindle between thebearings is mounted a driving pulley 6 .and the spindle nose 7 extendsforwardly from the bearing 4, the spindle being hollow and adapted atits forward end for the reception of colletsy or centering pins 8, orthe like, a centering pin being shown in Fig. 1. The material 9 to beworked is centered between the pin 8 and the tail stock centering pin10. A driving plate 11 engages the dog 12 which is secured to themateria 9 for causing rotation thereof as the driving plate rotates. Alongitudinal slot 13 extends rearwardly from the front edge of thespindle nose and nma be arallel with the spindle axis. Near t e en ofthe nose this longitudinal slot in Fig. 1 is shown as branching spirallyin either direction to form spiral slots 14 and 15. A pin 16extendsthrough depending upon the direction orsu sequent n malaria thelathe' or, the driving im' is pushed on the nose until the pin reac esthe end of 'the horizontal slot and then upon starting ofthe lathe thepin is automaticall e a ed by the corresponding spiral slot. t Wri eseen that this spiral slot exertsv a 'wedging or drawing-in action onthein and consequently upon outward lrotation be'- tween the driving plateand spindle the plate will be irmly clampedto the tapered nose and thereater the resistance' olered the greater wl bethis drawing-in tendencyand the more securely will the plate be clamped in place on the spindleend. If the lathe is adapted for traveling only in one direction, onlyone spiral slot would be necessary and two or more slots might beemployed and a A corresponding number of pins, as shown in v slot or sots placed in t e wor pins mi ht readily Fig. 2. As a modification, thes indle ends may be rovided with a in or ins and the driver, as shown inFigs. 3 and 4, and with this arrangement the same results will beaccomplished.

Where the taper angle of the nose is great enough, suicient engagingsurface maybe providedfor the pins by having the longitu dinal slot cutarallel to the axis of the spindle. `Where t e taper angle is small,however, this construction would not oifer sufficient surface to theins, and the ends of the 'se sheared off; In such cases I t ereforeprefer'to cut the base of the lon itudinal slot parallel to the oppositeside of t e nose, as shown in Fig. 6, the base 18 of the slot 13 beingparallel to the opposite edge 19 of the nose. he driving late is appliedin the same manner-as descri ed before, the

pin 16 passing along the slot 13 andthe tapered bore of the platefinally snugly engaging the correspondingly tapered nose.

also perfer to cut the walls 20, 2 1 of the slots at an angle as shownin Fig. 6. This insures engagement of the pin -end with the for threadedengagement in other machines i besides lathes.

be limited to the adaptation herein shown nor to the exact constructionand arrangement of the arts, as modifications may readily be ma ewithout departing from the Asco e ofthe invention.

I do not, therefore, wish to claim as new and desire to secure byLetgaging said longitudina and s iral slotwliereby said attachment maybe c amped on said nose.

lathe spindle having a tapered nose, of a longitudinal slot extendingrearwardly from the end of the s indle nose and having its side wallsparalle to the axis of the spindle, two spiral slots extendingrearwardly in opposite directions from the end of said longitudinalslot, and a work driving attachment having a tapered opening to it theta ered nose and a projection engaging in said s ot.

3. In a lathe, the combination with a lathe head spindle having atapered nose, of a slot extending rearwardly from the end of the spindlenose, iirst longitudinally and then s ira ly, the base of thelongitudinal part of t ie slot being parallel to the opposite edge ofthe tapered nose, and a work driving member having a -tapered openingfor engaging the tapered nose and having a projection for engaging insaid slot.

4. In a lathe, the combination with a driving supporting member in theform of a tapered spindle, of a driven member having'a tapered bore tofit the drivin member, a slot in the engaging surface o one of saidmembers extending from the ed e thereof, said slot being longitudinaland t en spiral, and a projection on the other member for en aging insaid slot. y

n witness whereof, I hereunto subscribe my naine this 5th day ofNovember A. D., 1904. i

FRANKLIN HARDINGE.`

HARVEY L. HANsoN.

2. In a lathe head, the combination with a

